diff --git a/README.md b/README.md
index e3c714c..037ebc2 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ Usage
 **1.** app/build.gradle 파일에 아래 구문을 추가해주세요.
 ```
   repositories {
-    jcenter()
+    gradlePluginPortal()
   }
   dependencies {
     compile 'com.naver.speech.clientapi:naverspeech-ncp-sdk-android:1.1.8'
diff --git a/samples/EPDTypeAutoSample/app/build.gradle b/samples/EPDTypeAutoSample/app/build.gradle
index ef9c617..b0111aa 100755
--- a/samples/EPDTypeAutoSample/app/build.gradle
+++ b/samples/EPDTypeAutoSample/app/build.gradle
@@ -19,7 +19,7 @@ android {
 }
 
 repositories {
-    jcenter()
+    gradlePluginPortal()
 }
 
 dependencies {
diff --git a/samples/EPDTypeAutoSample/build.gradle b/samples/EPDTypeAutoSample/build.gradle
index 87ba82b..e376a06 100755
--- a/samples/EPDTypeAutoSample/build.gradle
+++ b/samples/EPDTypeAutoSample/build.gradle
@@ -2,7 +2,6 @@
 
 buildscript {
     repositories {
-        jcenter()
         google()
     }
     dependencies {
@@ -12,7 +11,6 @@ buildscript {
 
 allprojects {
     repositories {
-        jcenter()
         google()
     }
 }
diff --git a/samples/EPDTypeHybridSample/app/build.gradle b/samples/EPDTypeHybridSample/app/build.gradle
index ef9c617..b0111aa 100755
--- a/samples/EPDTypeHybridSample/app/build.gradle
+++ b/samples/EPDTypeHybridSample/app/build.gradle
@@ -19,7 +19,7 @@ android {
 }
 
 repositories {
-    jcenter()
+    gradlePluginPortal()
 }
 
 dependencies {
diff --git a/samples/EPDTypeHybridSample/build.gradle b/samples/EPDTypeHybridSample/build.gradle
index 87ba82b..e376a06 100755
--- a/samples/EPDTypeHybridSample/build.gradle
+++ b/samples/EPDTypeHybridSample/build.gradle
@@ -2,7 +2,6 @@
 
 buildscript {
     repositories {
-        jcenter()
         google()
     }
     dependencies {
@@ -12,7 +11,6 @@ buildscript {
 
 allprojects {
     repositories {
-        jcenter()
         google()
     }
 }
diff --git a/samples/EPDTypeManualSample/app/build.gradle b/samples/EPDTypeManualSample/app/build.gradle
index ef9c617..b0111aa 100755
--- a/samples/EPDTypeManualSample/app/build.gradle
+++ b/samples/EPDTypeManualSample/app/build.gradle
@@ -19,7 +19,7 @@ android {
 }
 
 repositories {
-    jcenter()
+    gradlePluginPortal()
 }
 
 dependencies {
diff --git a/samples/EPDTypeManualSample/build.gradle b/samples/EPDTypeManualSample/build.gradle
index ab5a66e..e539d26 100755
--- a/samples/EPDTypeManualSample/build.gradle
+++ b/samples/EPDTypeManualSample/build.gradle
@@ -2,7 +2,6 @@
 
 buildscript {
     repositories {
-        jcenter()
         google()
     }
     dependencies {
@@ -12,7 +11,6 @@ buildscript {
 
 allprojects {
     repositories {
-        jcenter()
         google()
     }
 }